SpinOffs

A blog on what's new, notable, and next in turbomachinery

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Calculating Surface Roughness and Cusp Height for Ball End Mills

By Ryan Lussier, Senior CAM Software Product Manager
Aug 20, 2026

Imagine you're finishing an impeller blade with a ball end mill. The drawing calls for a specific surface finish, but now you need to determine the toolpath parameters that will achieve it. Should...

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Calculating Surface Roughness and Cusp Height for Ball End Mills

Thomas Gresham, Senior Mechanical Design Engineer

The Gyroscopic Effect

The Gyroscopic Effect

By Thomas Gresham, Senior Mechanical Design Engineer
Mar 6, 2024

This post covers one of the fundamental issues that makes rotordynamics a unique subject: The Gyroscopic Effect. The gyroscopic effect can be observed in the behavior of spinning tops, fidget...

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Critical Speed Maps

Critical Speed Maps

By Thomas Gresham, Senior Mechanical Design Engineer
Aug 16, 2022

This post is about one of the most useful design tools for rotordynamics of turbomachinery: The Undamped Critical Speed Map. A critical speed map can provide a great deal of insight on the potential...

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